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| author |   Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2014-01-13 11:34:24 +0530 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-01-15 15:46:38 +1100 |
| commit | b3084f4db3aeb991c507ca774337c7e7893ed04f (patch) | |
| tree | c5cad3a6843272a173e95a87a6087d362e19073e /Documentation/devicetree | |
| parent | Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc (diff) | |
| download | linux-dev-b3084f4db3aeb991c507ca774337c7e7893ed04f.tar.xz linux-dev-b3084f4db3aeb991c507ca774337c7e7893ed04f.zip | |
powerpc/thp: Fix crash on mremap
This patch fix the below crash
NIP [c00000000004cee4] .__hash_page_thp+0x2a4/0x440
LR [c0000000000439ac] .hash_page+0x18c/0x5e0
...
Call Trace:
[c000000736103c40] [00001ffffb000000] 0x1ffffb000000(unreliable)
[437908.479693] [c000000736103d50] [c0000000000439ac] .hash_page+0x18c/0x5e0
[437908.479699] [c000000736103e30] [c00000000000924c] .do_hash_page+0x4c/0x58
On ppc64 we use the pgtable for storing the hpte slot information and
store address to the pgtable at a constant offset (PTRS_PER_PMD) from
pmd. On mremap, when we switch the pmd, we need to withdraw and deposit
the pgtable again, so that we find the pgtable at PTRS_PER_PMD offset
from new pmd.
We also want to move the withdraw and deposit before the set_pmd so
that, when page fault find the pmd as trans huge we can be sure that
pgtable can be located at the offset.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'Documentation/devicetree')
0 files changed, 0 insertions, 0 deletions